7A Angles and triangles

Find the value of a.

• 90

• 123

• 33

• 55

Determine the values of the pronumerals and name the type of triangle shown here.

• 60, equilateral triangle

• 60, isosceles triangle

• 60, right-angled triangle

• 70, equilateral triangle

Find the value of each pronumeral.

• a = 120, b = 120

• a = 40, b = 140

• a = 100, b = 140

• a = 140, b = 100

Find the value of r.

• r = 40

• r = 50

• r = 70

• r = 110

Calculate how many degrees the minute hand of a clock rotates in 2 hours.

Calculate how many degrees the minute hand of a clock rotates in 72 minutes.

Find the value of each pronumeral.

• a = 60, x = 150

• a = 80, x = 120

• a = 120, x = 60

• a = 60, x = 120

what type of angle between the hour and the minute hands at 3 : 45 a.m. ?

• acute angle

• obtuse angle

• straight angle

• reflex angle